Seems there is a class casting error caused when loading up a spear (see log below).
I had the Iris shaders mod installed (includes sodium) could that be causing the problem? or is it a bug in this mod.

Log file:
[00:00:33] [Render thread/FATAL]: Reported exception thrown!
net.minecraft.class_148: Rendering screen
at net.minecraft.class_757.method_3192(class_757.java:883) ~[intermediary-1.17.1.jar:?]
at net.minecraft.class_310.method_1523(class_310.java:1112) ~[intermediary-1.17.1.jar:?]
at net.minecraft.class_310.method_1514(class_310.java:728) [intermediary-1.17.1.jar:?]
at net.minecraft.client.main.Main.main(Main.java:217) [intermediary-1.17.1.jar:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:?]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:?]
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:234) [fabric-loader-0.11.6.jar:?]
at net.fabricmc.loader.launch.knot.Knot.launch(Knot.java:153) [fabric-loader-0.11.6.jar:?]
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:28) [fabric-loader-0.11.6.jar:?]
Caused by: java.lang.ClassCastException: class chronosacaria.mcdw.bases.McdwSpear cannot be cast to class net.minecraft.class_1766 (chronosacaria.mcdw.bases.McdwSpear and net.minecraft.class_1766 are in unnamed module of loader net.fabricmc.loader.launch.knot.KnotClassLoader @5e21e98f)
at net.minecraft.class_1799.handler$dgb000$getTooltipMixin(class_1799.java:7338) ~[intermediary-1.17.1.jar:?]
at net.minecraft.class_1799.method_7950(class_1799.java:677) ~[intermediary-1.17.1.jar:?]
at net.minecraft.class_437.method_25408(class_437.java:181) ~[intermediary-1.17.1.jar:?]
at net.minecraft.class_437.method_25409(class_437.java:168) ~[intermediary-1.17.1.jar:?]
at net.minecraft.class_481.method_25409(class_481.java:742) ~[intermediary-1.17.1.jar:?]
at net.minecraft.class_465.method_2380(class_465.java:190) ~[intermediary-1.17.1.jar:?]
at net.minecraft.class_481.method_25394(class_481.java:703) ~[intermediary-1.17.1.jar:?]
at net.minecraft.class_757.method_3192(class_757.java:874) ~[intermediary-1.17.1.jar:?]
... 10 more

Please send me the whole crash log, not just part of it. Having only part of it doesn't actually help me

ok sorry I will send both the crash report now.

Crash report:
https://pastebin.com/7xMdinMB

Awesome! Thanks, so much!

Well, I can confirm that it is not a bug with the mod. I tested it with just the mod installed and I did not get the crash. I am going to test with Iris now

The issue also, does not appear to be caused, specifically, by Iris, either as both mods can be installed without causing an issue. Something is trying to force the spears to be classified as a MiningToolItem when they are actually McdwCustomWeaponBase which are both extensions of ToolItem. I am not sure what is causing this issue, but it does not appear to be my mod, though it would appear that my mod is being affected by something else. I'll try to figure this one out.

Thanks for bringing it to my attention, even if it looks like there really isn't anything that I can do to help with this one at this time

Yeah the problem must be with another mod. Thanks for helping though

Actually, I see that you are using Dashloader, I think that it could be what is causing the issue. It tends to skip a lot of initialisation steps

I just tested it without dashloader. The problem no longer exists ahaha.